The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

Legends surround this jagged rock formation in the New Mexico desert.

A museum dedicated to the alleged Roswell Incident.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

Twenty-seven massive radio antennas on the high plains of New Mexico search for life on other planets.

Some 2,000 carvings show this rare desert spring has been an oasis for travelers for over a thousand years.

See massive fossils that are over 200 million years old in northeastern Arizona.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

An homage to everyone's favorite prehistoric cartoon family.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

The location where the iconic movie character declared it was time to go home.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

The hallowed remains of a 900-year old Ancestral Pueblo great house.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The rusted remains of a victim of Hurricane Ike.

A natural swimming hole that was once a ceremonial center for Mayan priests.

This collection of historical artifacts and tropical wildlife waits just beneath the surface of the water.

This statue of the great Argentinian car driver is located near a famous curve of the Monaco Grand Prix.

A public urinal so pretty, it was declared a national monument.

This is why we can't have nice things on the Incan Trail.

Astronomical observatory above Lake Titicaca.